Electric burglar-alarm device.



R. 0. JONES;

ELECTRIC BURGLAR ALARM DEVICE. APPLICATION FILED MAY 13, 1912.

5 724 Patented Feb. 11, 1913:

. P '07- Ill WITNESSES ROBERT C. JONES, OF BROOKLYN, NEW YORK.

ELECTRIC BURGLAR-ALARM DEVICE.

Specification of Letters Patent.

Application Trier". May 13, 1912. Serial No. 696,912.

.b all whom it may concern Be it known that I, llonnn'r C. Jonas, a citizen of the United States. and residing at Brooklyn, in the county of Kings and State of Ncw,Y ork, have invented certain new and useful Improvements in Electric Burglar-Alarm Devices, oi which the following is a specification, such as will enable those skilled in the art to which it appcrtains to make and use the same.

This invention relates to alarm devices, and the objectthcreof is to provide an improved device of this class designed particularly for use in commotion with windows and which is simple in construction, efficicnt in operation and comparatively in-- expensive.

. The invention is fully disclosed in the following specification of which the accompanying drawing forms a part, in which the separate parts or my improvement are desio noted by suitable reference characters in each of the views, and in which Figure 1 is an inside sectional view of one sideof a window provided with my improved burglar alarm device, and Fig. 2 a

section on the line 2 2 of Fig. 1, with the arm of the device in the position shown in dotted lines in said figure.

In the drawing forming part of this specification I have shown at a one side of a Window frame to which is secured an inner molding strip 7) an'outer strip a and a cen tral head or strip (Z. It. will be understood that both sides of the window frame are similarly provided and this construction forms two vertical spaces in which the innor sash e and the outer sash f are. vertically movable, and said sashes are provided with the usual top and bottom rails e and y.

In the practice of my invention I secure to the front molding strip 1) an oblong plate 9, composed of insulating ma erialon the bottom part of which is secured. a metal plate h, this connection being made by means of screws 2' andi and the plate h is provided with a post and pivoted to the plate It atk is an arm m composed of two parts connected at m by an elbow joint, and the outer end portion of said arm is composed-of separate parts one of which is longitudinally adjustable on the other, these parts being connected by a set screw m, and the end portion of the adjustable part is provided with a rubber bufier m and a proection or tooth m,

Mounted on the pivot pin a which connects the separate parts of the arm in is a collar if having a downwardly directed finger a" with which is connected a spiral spring 11" which is always under tension and which is connected with the post The platc is provided centrally of the back thereof with a recess or chamber 0 into which the screw 4" passes, and another screw 0 is passed inwardly through said plate Patented Feb. 11. 191.3.

and is provided with a large circular head 0, and the screw i and the screw 0 form binding posts with which are connected wires 0 and c which connect with an alarm device. 0, and in the circuitthus formed is placed a battery 0 The hcad 0 of the screw 0" is provided with a stop 7) which limits the movement of the arm m in the direction of the arrow It, and the inner part of the arm mat the hinge m thereof is provided with a contact projection adapted, when said arm in the position shown in dotted lines in Fig. 1, to make contact with the stop 79. The arm m is also composed of metal and it will be observed that the spring a serves to hold said arm in the position shown in full lines in Fig. 1, and also in the position shown in dotted lines, the line 1' serving toshow the center line of the action of said spring, and the position of said arm, shown in full lines, in the operative position, while the position shown in dotted lines is the inoperative position, but in this last named position the circuit is closed through the alarm device 0 and said alarm device will be operated.

Suppose the parts to be in the position shown in Fig. 1. It now, the bottom sash 1 (2 no raised the top rail thereof Wlll strike the arm mand force said arm lnto the position shown in dotted lines 1n Fig. 1, and

the alarm device. 0 will be operated. If any attempt be made to lower the top sash the end m of the arm m, which bears on the front face of the side f of the top sash, will catch against said face and the front end portion of the arm m and will be forced downwardly in the direction of the arrow of, the arm bending' at m to permit of this operation, and in operation said arm will be forced backinto the position shown in dotted lines and the alarm 0 will be operated. lVhen the arm' has once been forced into the position shown in dotted lines in Fig. 1, it must be forced back into the position shown in full lines by hand, and when said arm has once been bent at m it must be straightened by hand, if, the backward movement thereof when stopped by. thepost p is not suflicient to throw the end portion of said arm back into its normal position.

The collar 01 is free to rotate on the pin n,

and it will be understood, that the alarm device 0 may be placed at any desired point or in any preferred position, and my invention is not limited to the various details-of Letters Patent, is

1. In an alarmapparatus of the class de-.

scribed, a plate having means whereby it may be secured to one side "of a window frame, an arm pivoted to said plate and adapted to swing in aplane at right angles to the plane of the sashes when the plate is in place, a spiral spring connected with said plate and said arm and adapted to hold said arm in two different positions in one of which it bears on the adjacent sash, an

open electric circuit I of which said arm forms a part and an electricalarm device placed in said circuit andforming a part thereof.

2. In an alarm apparatus of the class described, a plate having means whereby it may be secured to one side of a window frame, an arm pivoted to said ,plate and adapted to swing in a plane at right angles to the plane of the sashes when the plate is inplace, a spiral spring connected with said plate and said arm and adapted to hold said arm in two different positions in one of which it bears on the adjacent sash, an open electric circuit of which said arm forms a part, an electric alarm device placed in said I circuit and, forming a part thereof, said arm being composed of two parts connected. by an elbow 30int and the outer end portion thereof being composed of separate parts one of which is adjustable.

In testimony that claim the foregoing as my invention I have signed my name in presence of the subscribing witnesses this 11th day of May 1912. ROBERT C. JONES.

Witnesses C. lVlULREANY, S. Axnnnws. 

